Metallogenesis and Tectonics of the Russian Far East, Alaska, and ...

(5) The Angayucham Ocean (Kobuck Sea of Plafker and Berg, 1994), along with the South Anyui Ocean, continued to
receive sparse continenlal-denved detritus. Previously rifted terranes, ~ncluding be Kilbuck-Idono cratonal (K1) and the combined
Nixon Fork-Dillinger-Mystic passive continental-margin (NX, DL, MY) terranes were near the North American Craton Margin.
(6) The dextral-slip imbrication of the Stikinia-Quesnellia arc and associated subduction-zone temes was completed
along the Tally Ho shear zone (Hansen and others, 1990; Hart, 1995). Or alternatively, the oroclinal warping of the Stkinia-
Quesnellia island-arc and associated subduction zone terranes was completed (not depicted in fig. 47; Mihalynuk and others,
1994). For either interpretation, migration of the Stikinia-Quesnellia arc and associated terranes toward North America was
accomplished by subduction and (or) obductian of Ihe Seventymile Ocean plate along the continental margin.
(8) The subduction-related volcanic and plutonic arc rocks of lbe Quesnellia part of the arc, consisting of the Takla
Group and the coeval igneous belts formed in response to continued subduction of part of the Cache Creek Ocean plate (CC;
Mihalynuk and others, 1994). The Stikinia part of the arc consisted of the extensive suite of the subductioo-related volcanic and
plutonic arc rocks of the Hazelton Group hich also forined in response to subduction of part of the Cache Creek Ocean plate.
Remnants of this oceanic plate may be preserved in the termne of ultrarnafic and related rocks which occurs discontinuously along
the Denali strike-slip fault (DE, fig. 47) for several hundred kilometers (Nokleberg and others, 1994b).
(9) Forming in the Stikinia-Quesneliia arc and continuing on fkom the Early Jurassic were the Coast Mountains (CM),
Copper Mountain (North; CMN), Copper Mountain (South; CMS), Galore (GL), Guichon (GU), Klotassin (U), Texas Creek
(TC), and Toodoggone (TO) belts which contain either granitic magmatism-related deposits or deposits related to felsic to mafic
marine volcanism.
(10) Also completed was obckrction of parts of the Seventymle and Slide Mountain Ocean plates onto the North
American Craton Margin (NAM; Mihalynuk and others, 1994). Migration of the Stikinia-Quesnellia arc and associated temes
toward the North American Craton Margin was accomplished by subduction of he Seventymile Ocean pkte along the continentalmargin
and by obduction.
(1 1) Outboard and perhaps at a lower paleoktitude (either 25" or 4S0), the Talkeetna and Bonanza arcs continued activity
in the Wrangellia supertenane (WRA). This extensive arc formed along most of the length of the Wrangellia supertemrna with
coeval equivalents in the Cadwallsder (CD) island arc and Methow (MT) turbidite-basin tmes. Forming ia the m and
continuing on from the Early Jurassic were the Talkeetna Mountains-Alaska Range metallogenic belt, which contains lcuroko
massive sulfide deposits, the Alaska Peninsula (AP) metallogenic belt, which contains Cu- and Fe-skam deposits, and the Island
Porphyry (IP) metallogenic belt, which contains granitic-magmatism-related deposits. Associated with the Talkeetna and Bonanza
arcs was subduction of part of the Cache Creek Ocean plate to form the Chugach (CG), Bridge River (BR), and possibly Baker
(BA) terranes.
Late Jurassic Metallagenic Belts
(163 to 144 Ma; Figures 48,49)
Overview
~hemajor~ate~uraegicnaetlllo~bbbkRPsrdtanFrct~~&&~
in table 3 and portrayed on 6gu.m 48 and 49. 'Phr:majar kb 8$f~ll~. (1) h thc h&m &%st, &% &k@ (A) btrlt,
which contains zoned mafic-* Ti dep&&, b W in .tosadxdWn&b plutons hlm&g !hmrka
zone terrane. The belt is intaprcted as fomxbg aha a &om aWin~11tal margin. (2) Also ia bh9 !hWa& i$ tbs
North Bureya (NB) belt of granitic-mgmhn-relaled deposits which is inteqmt6d as fbdnghhe UBPlaLsn $a&tm&dmargin
arc. (3) In the central part aftbe Rudan Far E!ast is the Stawvoy (ST) belt which contains smatecde, grsnl&--related
deposits and is interpreted af fodg during mxdioe aftha Burtya suptarmeto NU#& A&a Cta- [4),la tbra
Russian Northeast is the Chefsky-Argaw Raqw (CAR) belt of hvldro mamba &do deposits, and Ya@&cmp Rive
belt of granitic-magmatism-relM-I$, Both bebare hosted in the lndi@M%y vsWpWc
assemblage and are interpreted as forming m rlh+ Uyandina island are. (5) h tlrs Russian North- the Olny [UL) beb
granitic-magmatism-related dcpoh and is hoaber4 in the Oloy kW an. (63 h thc thaPekalhaeym bl?, whigih
contains basaltic Cu deposits, is hbsted io Late J d boeaaic W & ~ hkh eta m-~ tWdd& bctqm&&
into the Pekul'ney subduction-zone tarplo; (7) In he same re- the Tamvabey-Muhits [ TW Wt, which emt$b padihm
Cr deposits, is hosted in zod plukm. urd the Mahits (MA) && which CO~W hrrrdso d w s+&du
deposits, are both interpreted s formimg m the Mahit&iy island atc. (8) Also in the region, thc S ~ r@VN) y belt, ~ ~
which contains Au-Ag epithemul vein deposits, L bmtd in the Svytby-N~ vd& batt wK& kin&xp&dgil the
co-named island arc. (9) In the Ruaaira Nix&o~1t, Ah& aMt tht natbn Ch.tdb (hiibm, Butem ~P~
and Marshall (ESM), Kobuk CKB), Kuyul (KUY), South- Ahb (SWA), and Yubn-Kv& (MI) belt&, which rontain
podiform